/*
 * Copyright 2022 Nightingale Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
import _ from 'lodash';
import { alphabet } from '@/utils/constant';

const getFirstUnusedLetter = (usedLetters: string[]) => {
  for (let i = 0; i < alphabet.length; i++) {
    const letter = alphabet[i];
    if (!_.includes(usedLetters, letter)) {
      return letter;
    }
  }
  return 'Z';
};

export default getFirstUnusedLetter;
